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"""

>>> import copy

>>> bus1 = Bus(['Alice', 'Bill', 'Claire', 'David'])

>>> bus2 = copy.copy(bus1)

>>> bus3 = copy.deepcopy(bus1)

>>> bus1.drop('Bill')

>>> bus2.passengers

['Alice', 'Claire', 'David']

>>> bus3.passengers

['Alice', 'Bill', 'Claire', 'David']

"""

# tag::BUS_CLASS[]

class Bus:

def __init__(self, passengers=None):

if passengers is None:

self.passengers = []

else:

self.passengers = list(passengers)

def pick(self, name):

self.passengers.append(name)

def drop(self, name):

self.passengers.remove(name)

# end::BUS_CLASS[]